Ringing repeater



June 11, 1935, A. T. JESTER 2,004,759

RINGING REPEATER Filed July 12, 1934 Patented June 11, 1935 a 2 004 759 2,004,759 RINGING REPEATER Alfred T. Jester, Houston, Tex. Application July 12, 1934, Serial'No. 734,821

4 Claims. (Cl. 17984) Myinvention relates to ringing repeater circonnects repeating coil Tirom line W by opencuits for telephone systems and has for its obing conductors l9 and 20. ject 'the provision of certain novel improvements Now when ringing from line B through the in thecircuit whereby the ringing current can winding of repeating coil 1, unless some provibe' utilized to connect up relays for closing the sion was made to avoid it, the relay 4' would 5 local'circuitfrom either direction. close as well as relay 4 because "of the ener- I will describe the preferred form of my ingiZatiOIl f Winding Y vention by reference to the accompanying draworder to v n l y from: inawh n ing wherein the circuit is shown diagramringing f e a add ion rec fie l0 matically. of the same bridge type is connected between Referring now in detail to the drawing, I the transformer and t re h she at; th incoming lines fr one direc sistance unit ID in series with the rectifier 6 tion and at W the incoming lines from the other and resistance 9 shunted across the output of direction. The system embodiesa plurality of the rectifier 5 sufheiehhy control e p of rectifler't'ype Signal relays'mcluding the trans the rectifier 6 to set up across the lines 2| and 15 formers I and I, the bridge type rectifiers 2 22 a 011mm 01311051113 the Output currentfremand 2, condensers 3 and 3', and relays 4 and 4'.- the reehher It h be s e that the P051" Th operation of these relay systems is substam v tive terminal of rectifier 6 is connected to one tially the same as that disclosed in my applicaof relay Whhe the pesltlve termmal of tion Serial No. 734,820, for Rectifier type signal rectifier 2' is connected 9 h other 20 relay. relay 4'. Therefore, when ringing from the line E, the effect is to close relay 4 thus closing relay' 5', but the opposing current from rectifier 6 will cause relay 4' toremain open.

Assuming that the'ringing is taking place 5 The relay devices operate substantially as follows: The incoming telephone ringing current 25 passes through the primary winding of the transformer I. This induces current in the secondary winding of the transformer which in from line W, the same results will be produced except that in this case rectifier 6' is in parg i g g gg fizi i fi 1 122 3 2 5 32 2 1 allel with rectifier 2', and resistances l0 and 9 i correspond to resistances l0 and 9 of rectifier 6. termmal b bemg Fonnected (1.1rect1y.to one end Rectifier B setsup the necessary opposing curof the relay 4, while the terminal a, is connected rent to prevent rectifier 2 from operating its by means of the conductors I2 and I3 through relay Condensers g and provide a 1 the resistance t0 the other end of the relay sistance path for voice'currents when talking is 4. The condenser 3 connected across the terdone t h th ir uit from line E to W or minals of the rectifier serves the double purpose th reverse, 35

of acting as a filter and also increasing the cur- From the above description, it is believed that rent flow through the winding of relay 4. the operation of this device will be clear to those I will now describe more fully the operation Skilled in this art and that the advantages of of the repeater circuit which includes the two the ihvehheh Whl be readily apparent While 40 relay operating systems hereinbefore described. h e e e ohe specihh form o the ihveh 40 with the ringing currenhwhich may be the tlon, it is obvious that various changes may be .ual nineteen cycle ringing current, entering from made wlthoht departing from h spmt i line E, the path taken will be through the con- Scope l.nventlon as forth m the elalms tacts of relay 5 Over lines I 4 and '5 to the Split wherein it is intended to claim all novelty in the winding of repeating coil 1 winding of application as broadly as possible in view of the 45 e t transformer I, thus supplying current to recpnor h tifier 2 and winding of relay 4. This causes the gg g fis ggs g g 533 2 225 local contact of relay 4 to close which connects g a c r y e lines l6 and I! thus supplying current from bat- L A ringing repeater circuit for telephone 50 tery H to relay 5' over lines I! and I6, and

returning over line l8 to battery H. Energizmg two transmission lines, means to supply mg of relay 5 closes Its contacts eahjsmg ringing alternating current to either side of said teen cycle current to pass ever the hhe W and coil, a relay for each line controlling the con-.

56 at the Same time the operation of this relay nection of said coil to the transmission lines, a

lines comprising a repeating coil interconnecttwo transmission lines, means to supply ringing,

alternating current to either side of said coil, a relayfor each line controlling the connection of said coil to the transmission lines, a local source of current for said relays, and means actuated by the alternating current supplied to one side of said repeating coil to connect said local source of current to the relay controlling connection of the other side of said coil to its transmission line,-said means including direct current relays controlling completion of the local circuit through said'first named relays and means to rectify the alternating current and apply it to said relays.

3. A ringing repeater circuit for telephone lines comprising a repeating coil interconnecting two transmission lines, means tosupply ringing 1 alternating current to either side of said coil,

a relay for each line controlling the connection of said coil to the transmission lines, a local source of'current for said relays, and means actuated by the alternatingcurrent supplied to one side of said repeating coil to connect said local source of current to the relay controlling connection of the other side of said coil to its transmission line, said means comprising a pair of relays controlling completion of said local circuit through the first named relays, a'pair of rectifiers, one on each side of the repeater coil and having their input circuits connected thereto to be energized by application of alternating current to said repeating coil, the output sides of said rectifiers being connected across the respective coils of said pair of relays, and means to prevent actuation of the relayonthe output side of the repeating coil. I s v 4. A ringing repeater circuit for telephone lines comprising a repeating coil interconnecting two transmission lines, means to supply ringing alternating current to either side of said coil,

a relay for each line controlling the connection of said coil to the transmission lines a local source of current for said relays, and means actuated by the alternating current supplied to one side of said repeating coil to connect said local source of'current to the relay controlling connection of the other side of saidcoil to its,

transmission line, said means comprising a pair of relays controlling completion of said local circuit through the first named relays,,a, pair of rectifiers, one on each side ofthe repeater .coil and having their input circuits connected thereto to be energizedlby application of alternating current to said repeating coil, the output sides of said 'rectifiers being connected acrossv the, respective coils of said pair of relays, and means to prevent actuation of the relay on the output side of the repeating coil, said means comprising a rectifier feed from the input side of the re-' peating coil and connected to the relay to oppose the current from the rectifier across the output of the repeating coil. I

ALFRED T. JESTER. 

